https://qooah.com/2011/11/04/%e5%a4%96%e5%9c%8b%e7%a5%9e%e4%ba%ba%e6%88%90%e5%9c%a8-galaxy-nexus-%e5%8f%96%e5%be%97-root-%e6%ac%8a%e9%99%90%ef%bc%81ics-%e6%8a%8a%e7%8e%a9%e6%ad%a3%e5%bc%8f%e9%96%8b%e5%a7%8b/